Treatment Plan without diagnosis for Private Pay Clients

Most of my clients are private pay and I do not diagnosis them, unless necessary or desired. I may still work with things like anxiety, ADHD, etc, but I do not put it in their notes or treatment plan record. Some clients are there more for personal growth. I want to be able to create a treatment plan for these clients without having to assign a diagnosis to the treatment plan or to have the progress notes focus on a diagnosis either.